X5 mini will boot and read the files on the card looking for new firmware, LEDs will count up and then start flashing to indicate that Smoothieware is now running.

You may now connect to Smoothie with pronterface or Repetier Host at any baudrate. If using Windows, you will need to install an inf serial driver for it to recognize the "Smoothie-serial" showing up on your PC. http://smoothieware.org/windows-drivers . Mac OS/X and Linux have the drivers built in. You can ignore any messages about missing DFU drivers.

You can also connect to the X5 with any serial console program, which should be set to local echo and Linefeed line endings. Typing help will show a list of console commands available, useful commands are: